Joseph keayee



(No Model.)

J. KRAYER.

LITHOGRAPHIG PRINTING PRESS.

Patented May 30, 1882.

N. PETERS. Pmm-Lnhagnpher. washmgmn D, C.

UNTTED STATES PATENT @Tricia JOSEPH KRAYER, OF JOHANNISBERG-ON-THERHINE, GERMANY.

LITHOGRAPHIC PRINTING-PRESS.

o SPECIFICATION forming part of Letters Patent No. 258,770, dated May30, 1882,

Application tiled March 2, 1882. (No model.) Patented in Germany August16, 1979, No. 6,666.

To all whom it may concern:

Be it known that I, JOSEPH KRAYER, of J0 hannisberg-on-the-Rhine, Empireof Germany, havcinvented certain new and useful Improvements inLithographie Presses; and I hereby declare the same to be fully,clearly, and eX- actly described as follows, reference being had to theaccompanying drawings, in which- Figure l is a longitudinal sectionalview of the device on the line X X of Fig. 2. Fig. 2 is a frontelevation; Figs, a sectional view, showing the device for raising orlowering the stone; Fig. 4, a similar view ofa modied form of the samedevice. Fig. 5 is a horizontal sectional view, and Fig. 6 an enlargedview of a detail of the device.

My invention relates to devices for adjusting lithographie stones intheir holders, whereby the surface may be brought to a truly-horizontalposition and to theproper height for printing, and also-to mechanismhaving for its object to facilitate theplacing of the stone in and itsremoval from the holder. My said invention consists in certain devicesfor accomplishingthe ends named, constructed and operating substantiallyas hereinafter set forth.

Referring now to the iirst part of my invention, I would state thatgreat difficulty has heretofore been met with in adjusting lithographicstones in the holders by reason of the unevenness of the lower sideofthe stones, or due to inequality in grinding away the surface; and myinvention is designed to remedy this evil by providing the holder with anumber of supporting-wedges for the stone, the said wedges beingindependently adjustable, so as to bring the face of the stone trulyhorizontal, and being also so connected as to raise or lower the stonevertically.

In the drawings, ct is the plate, on which rests a second plate, 7c, onwhich latter the stone is laid, and Z1 b are wedges, four in number, oneof them being located in each corner of the holder. Each pair of wedgesis connected by a rod, c, which passes through the holder and isthreaded at the end d. Ratchet-wheels c e are screwed on the ends d, andhave collars that engage with suitable grooves on the bearings, so thaton turning the wheels the wed ges are drawn in or out, as the casemaybe. Levers ff are mounted on the sleeves of the ratchetwheels, andeachcarries a pawl, s, adapted to engage with the teeth of the wheels. Thesepawls are reversible, so that on throwing them into engagement with theteeth to the right or left the wheels may be made to turn vin eitherdirection, as may be desired. The two levers are connected by a rod, g,as shown in Fig. 2. The wedges b bear against inclined lugs on the underside of the plate a, while the wedges b bear against wedges 7L, mountedupon screwrods t', that pass through the side flanges of the plate a.The latter' is provided with lugs, which slide vertically in groovesa1in the sides ofthe holder.

In operation the stone is laid on theplate r, and is adjusted to ahorizontal position by means of the wedges b bh. The horizontality ofthe stone with reference to an axis at right angles to the rods c isattained by working either pair of wedges b b', as may be desired, theother pair being thrown out of gear, as it were, by turning its pawl sto a vertical position. As soon as a spirit-level laid at right anglesto the rods c shows that the stone is horizontal with reference theretoit is turned parallel to the rods c, and the wedges 'It are run in orout, as may be necessary, by turning the screw-rods i'. The surfaceofthe stone being thus adjusted horizontally, it is raised or loweredbodily to brin gits surface to the proper height for printing. Thisis-done by throwing the two pawls s into engagement with the wheels e onthe same side (either to the right or left of the shafts) and workin geither lever f. All four wedges, b b b' b', are thereby simultaneouslydrawn out or in, as the case may be, raisingorlowering the stoneverticallyi` The second part of my invention relates to a device forfacilitating the placing of the stone on or its removal from the platewhich supports it. These operations, especially in the caseof heavystones or such as nearly lit within the holder, are attended withconsiderable difficulty, and the stone is frequently chipped or broken.

I have devised an attachment for the holder whereby the supplementalplatec may be raised flush with the top of the holder, so that the stonemay be slid onto it or off it, as desired.

Through one side of the holder passes a shaft', fm, having a lever, l,and on the shaft is keyed at either end an arm, a. The latter areconnected by hars o q with bell-crank levers p, pivoted in the sides ofthe holder. In the ends of the levers p are studs or points, o', whichenter between teeth on the under side of the plate 7i'. This mechanismis duplicated on the opposite side ot' the plate. 0n turning the lever lin the direction ot the arrow the studs rise, lifting the plate r. Onreversing the motion ofthe lever the plate is lowered.

In Fig. 4 is shown a modified form ot' the same device. The lever lispivoted at i', and bars o o are pivoted to the lever at either side ofits fulcruin, and are attached at the opposite ends to arms a, thatarekeyed on the shafts m at either side of the holder. Arms p, projectingfrom the shafts in through slots in the Walls of the holder, serve tolift the plate 7c as the lever l is rocked.

Having thus described my invention, what I claim as new, and desire tosecure b v Letters Patent, is

1. In a lithographie press, the supportingplate for the stone, restingupon a series of wedges, as set forth, in combination with mechanism,substantially as described, for moving the same either singly, in pairs,or all at once, whereby the stone tntv be adjusted to a horizontalposition, and then raised or lowered vertically, as may be. desired.

2. In combination with the stone-holder, the wedges b b', connectedtogether at either side of the saine, the supplemental wedges h, andmechanism, substantially as described, for operating the wedgesin pairsor singly, substantially as set forth.

3. In combination ith the holder and plate a., the wedges b b h,ratchet-wheels e, screwrods rl, and connected levers f, having pawls s,as set forth.

Lt. In combination with the holder, the sup portingplate k for thcstone, and mechanism, substantially as described, for raising the sametiush ivith the upper edge of the holder, and for lowering it, as setforth.

5. In combination with the holder, the supporting-plate k, shaft m,lever l, rods 0 q, and bellerank levers p, substantially asdescribed.

(i. In combination with the stone-holder ota lithographie press, theplate a., having independentlv-movable wedges atthe corners thereof foradj nsting the plate horizontally, the su p` plemental supporting-platek, and mechanism, substantially asdescribed, forlifting the latter ilushwith the edge of thc holder, and for lowering it npoii the plate a, asset forth.

JOSEPH KRAYER.

Witnesses:

LoUIs BASSE, II. Dmznn.

